CVE-2026-80558 (GCVE-0-2026-80558)
Vulnerability from cvelistv5
Published
2026-08-26 14:37
Modified
2026-08-27 05:01
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
libceph: Avoid using invalid osd indices from primary_temp
A corrupted osdmap received from a Ceph monitor or OSD may contain osd
indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts
that don't exist, i.e., that are greater than max_osd or smaller than
CEPH_HOMELESS_OSD (-1). These indices are used to create the up and
acting set in ceph_pg_to_up_acting_osds(), called from calc_target().
While most of these osd indices are checked, the one from primary_temp
is not. Subsequently, this may lead to calc_target() returning this
(potentially invalid) index as target osd for a (linger) request.
Because the osd_state, osd_weight, and osd_addr arrays only contain
max_osd entries (with indices 0 to max_osd -1), this leads to
out-of-bounds accesses when trying to read values from these arrays.
This patch fixes the issue by adding a check to get_temp_osds(), so that
only valid osd indices from primary_temp are used, and it falls back to
using the primary from pg_temp or the up set if it is invalid.
[ idryomov: changelog ]
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 Version: 5e8d4d36bf23bb7baf027c479d54395840219928 |
||
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
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"vendor": "Linux",
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"versions": [
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"status": "unaffected",
"version": "0",
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"status": "unaffected",
"version": "5.10.266",
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{
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"status": "unaffected",
"version": "5.15.217",
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{
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"status": "unaffected",
"version": "6.1.184",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.153",
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{
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"version": "6.12.105",
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{
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"status": "unaffected",
"version": "7.1.10",
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{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Avoid using invalid osd indices from primary_temp\n\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\nthat don\u0027t exist, i.e., that are greater than max_osd or smaller than\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\nWhile most of these osd indices are checked, the one from primary_temp\nis not. Subsequently, this may lead to calc_target() returning this\n(potentially invalid) index as target osd for a (linger) request.\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\nmax_osd entries (with indices 0 to max_osd -1), this leads to\nout-of-bounds accesses when trying to read values from these arrays.\n\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\nonly valid osd indices from primary_temp are used, and it falls back to\nusing the primary from pg_temp or the up set if it is invalid.\n\n[ idryomov: changelog ]"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Malformed primary_temp data arrives in CEPH_MSG_OSD_MAP over TCP from a Ceph monitor (mon_dispatch) or OSD (osd_dispatch); calc_target() then uses the bogus osd index in lookup_create_osd()/reopen_osd() to index osd_addr/osd_state/osd_weight without any local syscall.\nAC:L - A compromised or malicious monitor/OSD can publish an incremental osdmap whose primary_temp sets an osd index \u003e= max_osd for a victim PG; once applied, calc_target() on pending I/O, linger requests, or map-driven resends deterministically uses that invalid index.\nPR:N - The attacker acts as the remote Ceph cluster peer delivering forged osdmaps to an already-connected kernel CephFS/RBD client and needs no local account, capabilities, or user-namespace privileges on the victim host.\nUI:N - Once a kernel Ceph client session exists, osdmap updates are applied automatically and scan_requests/kick_requests recalculate targets without any mount, open, or other victim interaction at exploit time.\nS:U - Impact is confined to kernel libceph client memory and state on the Ceph client host (heap disclosure, misrouted connections, crash); it does not cross VM, IOMMU, or container sandbox boundaries to another security authority.\nC:H - Invalid acting.primary indexes past the end of kmalloc-backed osd_addr, osd_state, and osd_weight arrays, performing out-of-bounds reads of adjacent kernel heap memory that can disclose pointers and other sensitive data.\nI:H - Attacker-chosen osd indices drive out-of-bounds reads whose results are treated as authoritative OSD addresses and state for ceph_con_open() and request routing, corrupting kernel client connection targeting in ways usable for further exploitation.\nA:H - Out-of-bounds reads with large crafted osd indices can fault on unmapped kmalloc slack and trigger kernel oops or panic; misrouted linger and I/O requests also cause persistent, repeatable client failure on each malicious osdmap update."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T05:01:46.707Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224"
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{
"url": "https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73"
},
{
"url": "https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20"
},
{
"url": "https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796"
},
{
"url": "https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6"
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{
"url": "https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f"
},
{
"url": "https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555"
},
{
"url": "https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042"
}
],
"title": "libceph: Avoid using invalid osd indices from primary_temp",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80558",
"datePublished": "2026-08-26T14:37:24.768Z",
"dateReserved": "2026-08-26T14:34:25.767Z",
"dateUpdated": "2026-08-27T05:01:46.707Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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